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/*
* Copyright (c) 2009, The Mozilla Foundation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the Mozilla Foundation nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY The Mozilla Foundation ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL The Mozilla Foundation BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Contributors:
* Ted Mielczarek <ted.mielczarek@gmail.com>
* Karl Tomlinson <karlt+@karlt.net>
*/
/*
* gdk-screenshot.cpp: Save a screenshot of the root window in .png format.
* If a filename is specified as the first argument on the commandline,
* then the image will be saved to that filename. Otherwise, the image will
* be written to stdout.
*/
#include <gdk/gdk.h>
#ifdef MOZ_WAYLAND
# include <gdk/gdkwayland.h>
#endif
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#if defined(MOZ_ENABLE_DBUS)
# include <glib.h>
# include <glib/gstdio.h>
# include <dlfcn.h>
#endif
gboolean save_to_stdout(const gchar* buf, gsize count, GError** error,
gpointer data) {
size_t written = fwrite(buf, 1, count, stdout);
if (written != count) {
g_set_error(error, G_FILE_ERROR, g_file_error_from_errno(errno),
"Write to stdout failed: %s", g_strerror(errno));
return FALSE;
}
return TRUE;
}
#if defined(MOZ_ENABLE_DBUS) && defined(MOZ_WAYLAND)
static GdkPixbuf* get_screenshot_dbus() {
char *path = nullptr, *filename = nullptr, *tmpname = nullptr;
GdkPixbuf* screenshot = nullptr;
const char* method_name;
GVariant* method_params;
GDBusConnection* connection;
auto sGApplicationGetDbusConnection = (GDBusConnection * (*)(GApplication*))
dlsym(RTLD_DEFAULT, "g_application_get_dbus_connection");
if (!sGApplicationGetDbusConnection) {
return nullptr;
}
path =
g_build_filename(g_get_user_cache_dir(), "mozilla-screenshot", nullptr);
g_mkdir_with_parents(path, 0700);
tmpname = g_strdup_printf("mozilla-screen-%d.png", g_random_int());
filename = g_build_filename(path, tmpname, nullptr);
method_name = "Screenshot";
method_params = g_variant_new("(bbs)", FALSE, /* include pointer */
FALSE, /* flash */
filename);
GApplication* app = g_application_new(nullptr, G_APPLICATION_NON_UNIQUE);
g_application_register(app, nullptr, nullptr);
connection = sGApplicationGetDbusConnection(app);
if (g_dbus_connection_call_sync(
connection, "org.gnome.Shell.Screenshot",
"/org/gnome/Shell/Screenshot", "org.gnome.Shell.Screenshot",
method_name, method_params, nullptr, G_DBUS_CALL_FLAGS_NONE, -1,
nullptr, nullptr)) {
screenshot = gdk_pixbuf_new_from_file(filename, nullptr);
unlink(filename);
}
g_free(path);
g_free(tmpname);
g_free(filename);
return screenshot;
}
#endif
int main(int argc, char** argv) {
gdk_init(&argc, &argv);
GdkPixbuf* screenshot = nullptr;
#if defined(MOZ_ENABLE_DBUS) && defined(MOZ_WAYLAND)
GdkDisplay* display = gdk_display_get_default();
if (display && GDK_IS_WAYLAND_DISPLAY(display)) {
screenshot = get_screenshot_dbus();
}
#endif
if (!screenshot) {
GdkWindow* window = gdk_get_default_root_window();
screenshot =
gdk_pixbuf_get_from_window(window, 0, 0, gdk_window_get_width(window),
gdk_window_get_height(window));
}
if (!screenshot) {
fprintf(stderr, "%s: failed to create screenshot GdkPixbuf\n", argv[0]);
return 1;
}
GError* error = nullptr;
if (argc > 1) {
gdk_pixbuf_save(screenshot, argv[1], "png", &error, nullptr);
} else {
gdk_pixbuf_save_to_callback(screenshot, save_to_stdout, nullptr, "png",
&error, nullptr);
}
if (error) {
fprintf(stderr, "%s: failed to write screenshot as png: %s\n", argv[0],
error->message);
return error->code;
}
return 0;
}
// These options are copied from mozglue/build/AsanOptions.cpp
#ifdef MOZ_ASAN
extern "C" const char* __asan_default_options() {
return "allow_user_segv_handler=1:alloc_dealloc_mismatch=0:detect_leaks=0";
}
#endif
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